Christopher Pitt has kicked off a new series of posts to his site covering the creation of a new blog system. It's not just any blogging system, however. In this system he's developing it as an asynchronous application using preprocessing. In the introduction to the project he fills in more of the details:

I’ve been building this blog, for a few days now, and it’s been a fun experience. This is partly because it’s an asynchronous application, and partly because it uses a lot of preprocessing.

I thought it would be interesting for me to describe how it is put together, in an ad-hoc sort of series. In the series, I’ll show bits of code and links to libraries I’ve used. I’ll talk about why I’ve chosen to do things in certain ways, and what I could improve (short of deleting everything and starting over with a mature framework).

In this first part of the series, he includes a "tiny bit of code" showing a component of the system before the preprocessing has been run. He's also posted the second part of the series that continues covering the functionality for handling "posts" in more depth (including the use of flat files for content storage and functionality to output Markdown content as HTML).